docs: def human(self):
          """Human-readable timestamp."""
          # get timezone offset
          delta_sec = time.timezone
          m, s = divmod(delta_sec, 60)
          h, m = divmod(m, 60)
          # create output
          format_string = "%Y-%m-%d %H:%M:%S"
          out = self.datetime.strftime(format_string)
          return out